There are two genes that determine the coat colour expression in some dogs: eumelanin and merle. These genes are located on two separate chromosomes. For the eumelanin gene, black coat colour (E) is dominant over red coat colour (e). The merle gene controls the degree to which these coat colours are expressed through incomplete dominance. The following table describes the merle gene expression. Genotype Phenotype MM White Mm Half colour (Grey or light red) mm Full colour (Black or Red) Two dogs heterozygous for both traits were crossed. What phenotypic ratio is expected in the F1 generation? Answer:           Phenotype: White Grey Black Light Red Red

In mice, coat color is due to the inheritance of three genes located on three different chromosomes.  The A gene which determine if a yellow band is present on the hair     ( A_= yellow band, aa= no yellow band ) and the B gene which determines if the hair is brown ( bb ) or Black ( B_).  The A and B genes interact to produce the following coat colors: Agouti:     A_B_ Cinnamon:  A_bb black:       aaB_ brown      aabb The third gene is the C gene, which determines if the mice has any hair pigment at all.  If the mouse has at least one C allele then the coat color will be determined by the A and B genes as described above.  However, if the mouse is cc in genotype it will be albino, regardless of the mouse’s A and B genotype. 1.If a AabbCc mouse mates with a aaBbcc mouse, what is the probability that the mouse will be born brown? (a) ½    (b) ¼  (c) 1/8   (d) 1/16   (e) none of the above

Pigment produced in cells which are located at the base of growing hairs is packedinto granules which are then transferred to the growing hair shaft. The gene controllingthis transfer of pigment granules to growing hair has the alternative allelesD : uniform distribution of pigment granules in hair ---- intense colourd : uneven distribution of pigment granules in hair -------dilute colourThe colour of cats homozygous dd, is diluted as shown below non dilute   dilute black dd blue brown dd lavender orange dd cream The colour of cats either DD or Dd is intense, or non-dilute. Note that alternativenames for colours are sometimes used. Seal for black, grey for blue, chocolate forbrown, lilac for lavender and red or yellow for orange. Genetically, there is nodifference between the particular alternatives.Examine poster 4 – cats. a. What is the genotype, with respect to the ‘B’ and ‘D’ loci of blue point kitten, lavender point kitten and brown point kittenb. What is the genotype…

Mutant female: yellow body and purple eyes.  Male: Normal Use: https://www.sciencecourseware.org/FlyLabJS/   Which mutant alleles are dominant? Which mutant alleles are recessive?   Which mutant alleles are sex-linked? Which mutant alleles are autosomal?   Can you tell at this point if the two genes are linked?   Show the results of the dihybrid analysis.  Are genes segregating independently? What is the evidence for or against this?   Show the crosses you will use to obtain the mapping data.   For the mapping crosses, Write out the crossing scheme and make a table of the results (ignore sex in this table, combine the male and female progeny). Identify the parental classes and the recombinant classes. For a 3-point cross, identify the double cross overs. Show your calculations for the recombination frequencies between the three genes (for the 3-point cross) or the two genes (for the two-point crosses).     Draw a map of the Drosophila chromosomes 2, 3, and X, including…

Suppose researchers identified two Drosophila melanogaster mutant phenotypes. One phenotype is called maniac and the other is called shiny. In order to determine the mode of inheritance of the mutant allele responsible for each phenotype, males that have both mutant phenotypes are mated with wild-type (wt) females to produce F₁ progeny. Then, the F₁ progeny are mated together and the F2 progeny are scored. F₁ phenotypic class maniac male maniac female n 481 478 autosomal dominant for maniac and X-linked dominant for shiny autosomal recessive for maniac and autosomal recessive for shiny autosomal dominant for maniac and X-linked recessive for shiny X-linked dominant for maniac and X-linked recessive for shiny What is the genotype of the original male parent? F2 phenotypic class maniac female maniac male What is the mode of inheritance for the genes controlling maniac and shiny? maniac, shiny male shiny male wt female wt male homozygous mutant at both loci heterozygous mutant at one…

Males of many diploid species (like us) have X and Y sex chromosomes. They are hemizygous for most X- linked genes. Thus, males express most X-linked alleles, whether they are dominant or recessive in females. In the fruit fly Drosophila, it is common to achieve the equivalent of a test cross of X-linked genes in females by assessing the readily observed phenotypes of their male progeny. Since males do not receive X-linked genes from their father, sires of these crosses can be normal or wild-type flies. In fly genetics, it is conventional to name a gene after the mutant phenotype that enabled its discovery. Your challenge is to establish gene order and map distances between three X-linked genes in Drosophila. Each gene is represented by recessive mutant alleles that express rather distinctive phenotypes relative to their dominant wild-type alternative alleles. Flies expressing fruitless (f) are bisexual, lush (1) have a heightened responses to ethanol, and ken&barbie (kb) lack external…

In water snakes, there are three different possible skin colors: Brown, Gray & Green.   BB=Brown BG=Gray GG=Green What are the possible genotypes & phenotypes from crossing a brown & gray snake? What type of gene action is being expressed in this example?

Please explain how you do this question step by step I am very confused! thank you:) You have three independent mutant alleles in the Drosophila gene no-antenna: nan1, nan2 and nan3.  You determine the phenotype of Drosophila that are heterozygous for the three alleles (heterozygous for a wild-type allele and a mutant allele), and that are homozygous for the three mutant alleles.  The antenna is composed of three segments that are followed at the distal end by a feathery arista (that is the antenna is composed of three segments and an arista). Allele nan1 nan2 nan3 heterozygous Wild-type No arista Wild-type homozygous No arista No antenna No antenna nan1 is a __x__ allele, nan2 is a __y__ allele, and nan3 is a __z__ allele.     X Y Z A Dominant negative Null Hypomorphic B Null Dominant negative Hypomorphic C Null Hypomorphic Dominant negative D Hypomorphic Dominant negative Null E Dominant negative Hypomorphic Null Referencing the table above, select the…